Rasp loading fixture



2 SheetsS heet 1 FIELEI P. C. NEILSEN RASP LOADING FIXTURE Feb, 16, 1954Filgd June 15, 1950 FIE. l

FIE- 2 w 1 V in Feb. 16, 1954 P. c. NEILSEN RASP LOADING FIXTURE 2Sheets-Sheet 2 Filed June 15, 1950 Patented Feb. 16, 1954 UNITED STATESPATENT OFFICEv Z-zCIaims.

1 The present invention" relates to a; 10ading:.devicerfor -us.e1inconnection with assembling arasp unit: In particular the presentinvention. is intendedzfor use. inconnection-with assemblingztireraspsizthat are equipped with toothed elements that-aare;.providediwithteeth extending in a substantially; radial: direction. outwardly on theperipheralface or surfaceofzaidrum: The drumtis intended to beamounted'q'ona shaft for rotation :anda-tires-Vtovbe' retrcaded arebroughtinto engagement with thezretatingteeth'for. preparing the treadsurface of the tire.

The. principal purpose; of the present invention is.-to':provideafixture thatcan be rigidly mountedton:a;.bench or workingasurface. Thisfixture is: adapted-to receive: first. of all, a perforated band-intowhich: are-:inserted the toothed? ele- -ments. Not only is the,perforatedz'band held in holding all of the toothed elements in placeWhile an inner holding band is inserted and brought into=:engagementwithall of the toothedrele'ments so as to permanently hold theseelements in place. The thus assembled bands are then removed from thefixture and theremaining parts offthecomplete rasp assembly are insertedinto this initial assembly.

Thepresent loading fixture is not only; very efiectiyejn accomplishingthe desired results. but

- it 'jissimple both in its construction and? in its operation, and itpermits the lo adinggoperation tobe completed rapidly.

The foregoingcons'titute some of the principal objects-end advantagesofthe present invention, others of which willbeeome apparent, from thefollowing description and the drawings, in which:

Fig. 1 is a front elevational view of a loading fixture embodying thepresent invention;

Fig. 2 is a side elevational View of the fixture shown in Fig. 1;

Fig. 3 is a vertical sectional View through the loading fixture, theview being taken along the line 3-3 of Fig. 1;

Fig. 4 is a front elevational view of a completely assembled tire raspof the type employed on the loading fixture illustrated in Fig. 1;

Fig. 5 is a vertical sectional view taken through the tire rasp, theview being taken along the line 5-5 of Fig. 4;

Fig. 6 is a fragmentary plan view of the aper- 2tuned1or'perforatedtband through. which: the toothed: elements proj ect;and

Fig. '7 is an enlarged. perspective: View. of one ofthe toothed:elements that isloaded into." the perforatedibandshowninrFig. 6.

For the purpose of illustrating-the presentinvention a single embodimenthas been. selected, though it is recognizedithat modifications maybemade without departing from: the intended scope oftheinvention.

Referring to Figs;v 1" 0023 inclusive; the invention comprises:generally'anupstanding bracket or frame Hir-that is, provided with: aflange or: foot portion- 5 l:- at" itsalower end andv an: outwardlyprojecting flange or bracket I2 at its upperend. The .frame I ii r isinitially 'firmly secured means of f'screws Itorthelike-onto thebench orworking surface indicated: at It insFig; 1.

Mounted on this frame It. is a' split bandrmember generally indicated atl5 that'. is provided at its upperendwith arsocketmember I (i i-thatprovides a channeleshapedsocket portion I-1 that is adapted? to: passover the flange l2. at the upper end; of the: frame 'ilfli' Asbest-shown iii-Fi 3a locking-spring member" ISrisboltedr as at l9 to theflangelZZ of the irame'ltf against theunderneath; face thereof; Thisspring. I 8:provides a wedge fit between the'socketpor'tion I1 andtheflange [2 of th'eframe.

The" split band I5 is provided with inwardly extending'arms 23 that.ineetfand are fastenedztogeth'er at 2!: The band -I5 is arcuatei'nshape,

terminating at;.-spacedr.edges 22 and mounted between; these spacededgesrZZ. is a. gate member: that: is: pivotally v1 secured: by means ofa bolt 24* to: a bracket member 25 that. is secured to vonerofrtherarms- 20: This-gate 2'3 is adapted tozpivotffrom :tlie:solidxiline' position: shown in Eigzil where itfcloses thespacebetween'therspaced edges 22 andi'formssarcontinuationrof the'arcuate i band: to pan. open?v or: broken: line position 23a Where thespace between the edges 22 of the band i5 is left open.

In describing the use of the loading fixture shown in Figs. 1 to 3,reference first should be made to Figs. 4 to '7 inclusive where a tirerasp is shown. The loading fixture is used in assembling the variousparts of this tire rasp.

Referring to Fig. 5, the rasp generally comprises a pair of hub members2! that are apertured so as to be mountable on a shaft 28. Mounted aboutthe peripheries of these hub members 27 is a resilient backing band 29,about which is circumferentially mounted a metal retaining band 38].Concentrically mounted about this retaining band 30 is a perforatedmetal band 3|, which as best shown in Fig. 6 is provided with a largernumber of perforations 32 over its entire surface. Disposed between theperforated band 3| and the retaining band 30 is a plurality of toothedelements generally indicated at 33. Each of these toothed elements 33(see Fig. '7) takes the form of a plate-like member 34 that has spacedalong its opposite edges a plurality of teeth 35, the latter of whichare adapted to project through the apertures 32 in the perforated band3| when the rasp is completely assembled. A nut 36 is threaded onto athreaded portion 31 of the shaft 28 and when tightened holds the raspparts in their assembled positions.

The operation of the loading fixture can best be understood by againreferring to Figs. 1 to 3 inclusive. The first step is to mount theperforated band 3| of the rasp concentrically over the split band I5 ofthe loading fixture. This is accomplished by first moving the gate 23 toits broken line position 23a shown in Fig. 1, and then by grasping thearms 20 and squeezing them toward each other to decrease the diameter ofthe split band l5 the perforated band 3| can readily be placed over thesplit band l5. While the gate 23 is still in its open position 23a thetoothed elements 33 of the rasp are inserted in the perforated band 3|so that they are disposed in the manner shown in Fig. 1. As thesetoothed elements 33 are placed in the band the band 3| is rotated aboutthe split band l5 until all of the required number of toothed elements33 have been inserted. The gate 23 is then swung to its closed or solidline position shown in Fig. l and then the entire assembly including thesplit band l5 and the now loaded perforated band 3| is removed from theframe I and placed in a horizontal position on a bench. The split band Htogether with the closed gate 23 serve as backing or retaining membersto hold the toothed elements 33 in place in the perforated band 3|.

As shown in Fig. 3 the width of the split band I5 is less than theoverall width of the perforated band 3| and initially the perforatedband 3| is mounted so that this split band |5 occupies substantially thecentral region of the perforated band. While the assembly is lyinghorizontally on a bench the metal retaining band 30 is inserted andforced inside the perforated band 3| and against the inner faces of allthe toothed elements 33. As the retaining band 30 is forced into placethe entire assembly that includes this band, the perforated band 3| andthe toothed elements 33 that are retained therebetween, is removed fromthe split band l5. The remaining elements of the complete rasp can beinstalled without further use of the loading fixture. These remainingelements include the resilient backing member 29 and the hub members 21.

Not only has the present loading fixture proven to be very efficient inits use but also the timerequired to complete the assembling steps hasbeen greatly reduced over that formerly required when using other knownloading fixtures.

The term narrow width used in the following claims is understood to meanthat the width of split band I5 is substantially less than the width ofa perforated rasp band 3| used with the split band. The difference inwidth between the two bands enables split band l5 to occupy a centralposition with respect to rasp band 3|. After all toothed elements 33have been loaded and gate 23 closed, retaining band 30 is forced partway into place through one side of rasp band 3|. Thereafter gate 23 isopened, and the split band [5 is partially collapsed if necessary, afterwhich the split band is removed from the other side of rasp band 3|.Meanwhile all toothed elements 33 are retained properly in position.

I claim:

1. A rasp loading fixture comprising an upright support, a substantiallyangular narrow width split band having spaced apart end edges, meansremovably mounting the split band on the support with the spaced apartedges disposed downwardly, and a movable gate pivoted to one of said endedges and adapted to span the space to the other end edge, the gatebeing arcuate to conform to the curvature of the split band and beingmovable to an open position to free the space between the end edges.

2. A rasp loading fixture comprising an upright support, a substantiallyannular narrow width split band having spaced apart end edges, a movablegate pivoted to said band and adapted to span the space between the endedges, the gate being arcuate to conform to the curvature of the splitband and being movable to an open position to free the space between theend edges, and means removably mounting the split band on the supportwith the spaced apart edges disposed downwardly, the mounting meansengaging the band only at the diametrically opposite side from thespaced apart edges.

PETER C. NEILSEN.

References Cited in the file of this patent UNITED STATES PATENTS NumberName Date 410,426 Metcalf Sept. 3, 1889 619,692. Perry Feb. 14, 18991,000,261 Hansen Aug. 8, 1911 1,573,183 Mehlum Feb. 16, 1926 2,358,110Simon Sept. 12, 1944 2,348,288 Fontaine May 9, 1944 2,560,735 NeilsenJuly 17, 1951 FOREIGN PATENTS Number Country Date 21,510 Great BritainOct. 7, 1903

